Dispensing pump



Match 17, 1925. 1,530,356 I I J. B. DAVIS DISPENSING PUMP Filed Nov, 92 2 Sheets-Sheet 1 INVENTO'R 5% W5 ATTORNEYS.

March 17, 1925. 1,530,356

, J. B. DAVIS DISPENSING PUMP 7 Filed Nov, 7, 1921 -2 Sheets-Sheet 2 INVENTOR ATTORNEYS.

Patented Mar. 17, 1925. v

JOHN 18.:DAVIS; on zsnnm'e'mnnn; Emmsaomisnms; FASSIGNOBJWO :emnmm; &' BARKER.

MLNNUFAG'BUBINGQCOMEANY;AKCORIORATIOHZOF assacmrsmws:

'msrnwsme. BUM-Pe APPlit'mltitn'l-tfiled Novembef 7,119.21... S'eiia1..No.,;-513,369.

Z 0 all whom (it may, amw'eim Be it known that JQ'HNZB; DAVIS, 2t citizen of LUiiitelcLStdtes; residing Springfield, in the ,c0,unty;-of .He nptlen. and State of h'fzissaclwsetts, hits invented {new and {useful Improvements in Dispensing; Piimps, of which "the. fol] iing.-.. fe specification.

The. pi esent; invention. ielates to improvementsl'in" d pensingpumpssuch 'as are ommonly used for. dispensing measured quantities ofgasoline o1" like'liquids;

In one aspect, the invention relates more pzn7ticu-1ar1yto qttantity stops-fol. pumps of the generaljtype above described and Leonitem plates the ,provisiojn'jfof [novel means whereby the steps .may be. seleiet-iv'e'ly .pQSi." tl'oned to. pledete'nmine' the amount of liquid to be deliverechby the pump.

One, obeet. of the lnventlo'n is toprovide, 7

in 4:1..IIIBELSHIiTIgQPtImP provided with E quail,- t-it'y stops jfojr liiniting the st1"ok of the pump piston and havinge casing enclosing ,said stops and the .supportingflstructure therefor, means moerablef 12011], the exterior of fleeces? ing'. for .mowzing' t-he.@stopsinto "andout [of working posit-ion.

Another object of thefinyentionisito pmovide, in connection with the above mentioned quantity stop actuating means, an enclosing,

c; sing ,or, housing 1'01: the, quantity Stops too-nstructect and ,hrranged' to facilit te the con? nection of said stops, and their. actuating means,-,

Other .ohj e cts ixof rthe enventiom together with thewfe liures of. geonstructio'n by which they are attainedfw'ill be apparent ffomjilhe following. description .ef the. .plteierred embodiment. thereof illustrated in the. whom: panying drawings jin which I f Fig.1 is-awien inuifront elevation, ofia dispensing" ;pump consti'ucted in accordance with,the.i11V.ent,iQ'11,;... r Fig. 2- is ,ejfrlgmentai y iew, inreMpele; mtioln, of the pump showninjrFig. 1;

Fig." 3 is awie'w; in sectional .eleyation, part1 broken .mvay of the. uppen. portion of the pump, shoAvingpertiehlerly thequantitty stops; 5 p i Fig. 4. is; a fragmentary .elevaitionel Wiew, on an .enhprged shale;- showing ,in' detail the censtnuction of one .of the. quemtitystops 5.

Y Fig-joist a .-.seot'io112i 1jVie'W tekenon'H'the tion showing certain ifeetm'es. of, :the pump Athe. .dfawingis, the. "invention is. illus- .trated aseifibodifct .inm. power -operated dis pensing pump of: the \typejdisdosed' in;vthe invent-oirs' prior U. TESL" Letters .Pttent. -.N0.

1 ,4.-L7f 5l1.,. grilnted ."March 5,1923. 7 In gene eral. Ithisv pump ,comp rise's. the: .nsiiial. pump c linder; 10. (Fig. 6): 'it'spiston; (nonsh n) and piston rod-12; a cnossehadlat carried bymhe piston nodJ2,;.1a peir.,of vertical iopenatingroc'lsm Connected atrthe'ir upper extremities .to' vthe. opposite ends of, the \crosshead end- Zeal-Tying;- pist0ns..,(not shown). ,at their ,lower extremities c0mp1'essed=air .cylinde'rs 18 fo'r'the operating pistons; .3. horizontal. shaft 20. having agpairz of gem-e122 fixled thereon and meshing with i reek teeth on the backs ,of th'operating rods 16 .jfor

constrainingsaid rodslto move ji-neunison; .a casing enclosingjhe above mentioned parts comp 'ising a ,oylindfi'cel,..body portion .24, (Figs, 1,2 and 6);- a cover. 26fhziyinga=centrawl elliptical. opening 528-fo1r,the. passage th rethmugh .o-i Qth'e. cross-head .14, and an upright; easing). or hQusring..--.3O extending above; the. ooilenflfi .andeiwithin :Lwhieh the quantity .sto'psend the supporting StI'HCtllIEG therefor are loo sated a discharge pipeflfiil (Fig. '1), .1@'e un .,fromhe ,pump cyllindeir anGL fisinggthroughlthecovei: 26.; and .ineans including .11 lcrenki'hanc'tlel .34 earried at one enc1.:of,,f't1,1e shaftflQfwhieh p rojeets outside of. tI11e-.,p.1.-unp casin ...am1 is. adapted .to .he ohit'ohed .ito; .saidfshaf-te to enable. the "pump. actuating mechanism to be. .ma-nual'ly opermtec-lf'when so desired, It should be: under.- stood that. tjhi'ougih' the agency of snitible' ennections. and e-siialg'leieontrel .veh e .CODIH' pressed .-.a'ir; or other fil'iid meter. pressure. is alw :ted to. be .edmittejdfbeneath .ithe. pistons 1111.1; ;cylindersL18.Zonexhansted.fmni.said

cylinders at the will of the operator of the pump. Upon the admission of air to the operating cylinders 18, the operating rods 16 are raised to actuate the pump through its suction stroke while the exhaustion of the air from said operating cylinders permits the pump piston, which is heavily weighted, to be returned by gravity into position for the start of another suction stroke.

With the exception of the casing or housing 30, all the above named elements are or may be of the same construction and all the moving parts above described operate in the same manner as corresponding parts disclosed in the above mentioned prior patent and, inasmuch as the present invention is independent of the particular construction and operation of these elements, further description thereof is considered unnecessary in this application. The housing 30, however, embodies in its construction, certain features of the present invention and will be hereinafter fully described.

In order that the pump may be set to deliver different predetermined quantities of liquid, a series of quantity stops 38 are provided which are adapted to be selectively positioned to limit, in different degrees, the stroke of the pump piston. The construction of the quantity stops and the manner in which they are mounted upon the pump is substantially the same as that disclosed in the inventors U. S. Letters Patent No. 1,449,218 granted March 20, 1923. Consequently it will not be necessary to describe in detail the common features of the two sets of stops, reference being made to said application for a complete disclosure thereof.

Briefly set forth however, the quantity stops 38 comprise fingers carried by an inverted U-shaped standard 40, the upright legs of which are rigidly secured at their lower ends to a circumferential flange 42 such as usually surrounds and defines the elliptical opening 28 in the casing cover 26, the arrangement being such that the crosshead 14 will travel between the arms of the standard as the pump piston reciprocates. The stop fingers 38 are adapted to be positioned at will across the path of the reciprocating cross-head and to this end the fingers are vpivotally mounted, one above another, upon a single vertical rod 44 that is rigidly supported in front of one leg of the standard 40. The pivot rod 44 extends through a plurality of ears 46 projecting from the standard 40, the ears being ar ranged in pairs and the stop fingers are severally mounted between the individual members of said pairs. Normally the stop fingers are inoperatively positioned as in dicated by full lines in Fig. 5 and in order that they may be operatively positioned in the path of thecross-head 14, the fingerp are severally adapted to be swung to bring their tree extremities into engagement with the opposite leg of the standard 40 from that upon which they are pivotally mounted. To frictionally hold the stop fingers in adjusted positions each finger is acted upon by a spring 48 4) which encircles the pivot rod 44 between the finger and the ear 46 immediately beneath the finger. To insuraccuracy of measurement of the liquid dispensed by the pump a stop screw 50 is threaded vertically through each stop finger at such a point that when the finger is set in operative position, as indicated by dash lines in Fig. 5, said screw will be located in vertical alinement with the central portion of the cross-head 14 and will thus constitute an adjustable limiting stop for determining the stroke of the pump piston. Locking pins 52 carried by the stop fingers prevent accidental turning of the stop screws after they have been initially adjusted and suitable means may be provided for sealing the locking pins to prevent unwaranted interference with the adjustment of the stop screws.

As so far described, the construction and from that disclosed in said application. In

accordance with the present construction, the two legs of the standard severally com prise flat elongated bars 54 and 55 (Figs. 3 and 5) having central longitudinal strengthening ribs 56 projecting from both. sides of said bars at right angles thereto, and each bar being further provided at one end with inwardly turned cars 58 and at the opposite end with feet 60 which are curved slightly to conform to the inside curvature of the flange 42 on the casing cover. The two bars 54 and 55 are cast separately and are connected, at their upper ends by means of a cross-bar 69 which is bolted to the cars 58, as shown in Fig. 3. The feet 60 are, in turn, bolted to the flange 42 of the casing cover.

To prevent upward or other yielding displacement of any of the stop fingers 38, while engaged by the cross-head 14, provision is made for reinforcing the stop fingers at their free extremities. To this end, in accordance with the present invention, the strengthening rib 56 at the inner side of the bar 54 is made wider than the rib on the outer side or. said bar. as shown in Figs. 3 and 5, and the wide rib 5G is provided with a plurality of notches 64 which are so lo cated that one notch will be opposite each stop finger 38 when the latter are assembled in the apparatus. Each stop finger 38 is cut away at its free extremity, as indicated at 66 those carriedby the-s in -Fig; to permit the gfingemto swing into the respective notch 5 641 and 0'; provided-flare jeotion 768; which is}; ada'zp Jjto -engege the vfence of4tl1e 4-noteh eehriW6 -.'Q.-I1d'. thLl S ut O limit h s ngi gmsmee w0f5 heswp nge when ithits; .-reeeh ed- ,the p osition shown Joy dash lines in Fig-+5 fWh'eIithus-p ositiojned, e upp ee Q wa tes'finee sgew shoulder; formed' by. the upper edge fees. of the e -0h. 4' nd -t sflat e nfome h free -end of ohmstophfinger so as Ito positively -.p IQWQQILty URWai d -*11106Q1I1ithereof henagesedaby' e wille d he her 54 and; T convenientl notches 16% tQr-medsthe-rei nth-f rl necessary, the upper edge-ideesof rdzpote-hes nay he inaehinedla'fter the a:r;ts' of the standard haw-3e heen ,assemhledso the ts-aid edge; faces will bGflQ-Otll'fitQLY lOGEttQdfi f "l-lFGSpeCt to the i 'fi g sfy c est ue ng'lth;stsmtl rd eLO in three separate {parts and bynotchinjg' one of sai dflpiirts, t' [provide rein'for oing shoulders for the stop, -fingers :the; operation oi casting the standardis nmteria-lly simplified. As shown, a stop, screw 66, siniijleggto r2111 stop ;fingers; may be threadedthroigl tl v erqsshar--6 2-nt the top of the standwrd lo xto cooperate-with:the cross hez d 14; to determine the .nmxin um stroke of the pump piston.

he pre ent a us h s mmlwrclw together with thelquantitystops .lnountee thereon. is enclosed within' a housing =30, as already described; 'To enablethe qua-ntity stops to 'be seleetiy lyp s iZtiOned ithout; the necessity of $61110 ngg orl opening jthe housing 30 the quantity stops tir-eseverally op,- ie e i e iu szte w th pa s rie of bu ons 7. (Figs-1.2 n J whi h. @YQ- nQU l Qd one above enother nspeced relation :in the side of said housing As, shown in Fig, each button {(0 is seouiTQQl to one end of a QV'IIQ rod 72 which extends substantially horizontally through en aperture in the housing end; is piyota'lly connected atgits; opposite or inner extremityto one of the gstop finger -38;

As shown, the inner-mostz port-ion of the u'i re-r-od {721s bent v 130 proyideiesubstantially vertical extre ity "7 (Fig- :4) A i'igh is laterally ofifisjet rtr-ointhe}, rest-of'wtherod to enable it to'project throughe iholerind' he stop finger near the pivoted end of thecla-tter. hen the stop fingersoccupy their norrnzil inoperatii e positione ;theg;br'rtto;ns 'TOiWill be held "closely incontaot with I the. outside; of the housing 80,-as fshow-niHEFig. 5-. By pull:

.ing the buttons 'outwerdly theistop tinge-rs may readily beswungint-o operative positi on to cooperate w thitlie cross-head l t, and the stop fingers may 21s, li 'e u dgrly {he returned to inoperative. v-po s'it g nsmerely pushing thebuttons-fi "in ywndly *fThe i en -3o enc together withfthe; qu a ellipticzi l eross seetioria eon-tour? e'oi respond' hereast with the to sjheeaoonneoted with? their, respectime stop fingers; itheiheusing QOH-is meg-lei as shown; in four longitudinal seginents compnising 1 relatiuely iui-deosikde@ieeesJS and EWQvifelflz: tiyely naimiow end pieoes .SQtaHdYi 'Q- Th segmented-Suave-cunvodtransversely to ,fit the SiCiGSliOrfttliB -CiI-QHII1Q1J8D filt11filingf} 1&2 While the..end segments :531161-582 we .zeurued (to .fit theendslof saiduflnnge, andta'll 0f-..fsa;idSg-* meat-s dill"? -SQQLHEQ1M afz -stenedt ga t; the: flower endsmo vthe flange, The cap 6'-isprovided with a depending: ellipticnlgfiangefil Whith is: of the s2i1nejsize-z1s the-flange 42 and et-o whielrthe .upper ends-of L-t-he housingL-segmentsm-re secured. The ,.-housing segments are designed ztof bet oined itogether iin overleipping reletion. Theflend segments 8 Q-1a 11d 82 are preferably arranged iththeirwen tieultedge-s overlapping their aioent; vertical edges of the side segments;=TS,--as=-shown ,in Eig.vv 5,- inasmuch qas .sueh an terrengement Hifidrds: she-titer vj oints; between ;the! segments. It is obviousthat :in assembling athe :p ilitswf the housing '30, thetend segment-ySQ-Treednot be fasseinhle-(l '.\1nt-i.l;1eftergthe..sideesegmeuts and -'the, @opposite endrseg nent; ;8(.l,.lh we been in. pla-,ce,. thus lpeemitth g' :the, Workman jto l reach in through thesopen end -..-of-the4 hens;-

conveniently :tO insert the inner endsnof the rqdsg f72 ;i'n.ithedholes doubled to reoeiwe them: iii-the stop fingers w38.1 As shown in Figsifi and 6,. .onelofethc operating rods; 16 is; extended;shore@theceross-hen d115- to carry a pointer 86, ,andxthe end segment 82 vof the housing 80 isiprovidedWith'a longitudinally oXt-endin i slot SSW-rough whichsaid pointer extends o cooperate with a scale plate--on the exte '-o r,.1o-t'ssid; segmentennd thus lto :in}

'dioatef th ehqualntity .otliouid to he ideliyered hyuthe pump. The c,r osshead 14,;is pre ir erajblyi prouidednui-th a post-9l= igsei; wind 6'):-which rises from ;its,.eentra-l portion gtO, on-e rageqthestop soreivsoO on the quantity stop fingers 38.:

' In operating: n the H described pump .by power, through theoagency-of' the compressedeir vcylinders l8.cthe punmp piston moves substantially mnito1\1nly -thro1uqhout its; .strokefrom tlie itime theopowenis applied to thecylinders .18. until it-is,discon,-. nected theiiefroin, as is usual in -2vll'-p o;weroperated dispensing pumps so ,far tIStllOnlIb ventor is aware. This zirizangement has, 21

disadvantage over hand-operation Where l the pump piston may .be, contuolle dot-0 move aswslowlyas desired; Thus 'it frequently heppenstthat. the purql'iaser wishe-sto (fill-Ea tankvimd-yet-is doubtful Whether.theqtank vses-l the sta ndgird 40 purehaserl. naturally uwatches- 1 the, tainkhnnd.

as it becomes nearly full instructs the operator of the dispensing pump to pump slowly and to be ready to stop at an instants notice. With the power operated pump as generally provided the above condition can not be met and there is danger of overflowing the tank.

In accordance with the present invention means is provided for controlling the speed of the pump piston while the latter is being operated by power so that the speed of the pump may be retarded as and when desired or, if necessary, stopped altogether before it has completed its full stroke. The means for controlling the speed of the pump piston as above indicated consists of the brak ing device illustrated in Figs. 7 and 8. The device therein shown consists of a drum 92 fixedly secured to the shaft of the pump, a brake shoe 94: for cooperating with the drum 92 and means for applying'the shoe to the drum. For convenience in assembling the drum upon its shaft the drum is made on two parts divided along an axial plane and clamped together and to the shaft by bolts 96. To provide a maximum area of braking surface, the drum 92 is provided with a deep peripheral groove 98, while the brake shoe is formed with a segmental rib 100 the opposite sides of which are adapted to frictionally engage the side walls of the groove 98. The side walls of the groove 98 are in clined toward the base of the groove and the side walls of the brake shoe rib 100 are similarly inclined to cooperatively engage the walls of the groove. No portions of the brake shoe 94 other than the inclined side walls of the rib 100 are adapted to engage with the brake drum and consequently the corresponding inclined portions of the rib and groove will be brought into cooperative relation by the application of pressure to the outer periphery of the brake shoe.

The means for applying pressure to the brake shoe so as to set the brake comprises a lever 102 which is fulcrumed on a stud 104, the latter projecting from a bracket 106 (Fig. 6) which serves to guide one of the operating rods 16 of the pump actuating mechanism. The fulcrumed end of the brake shoe operating lever 102 is forked, as shown, to embrace a pair of lugs 106 which project from the outer periphery of the brake shoe and which in turn embrace the fulcrum stud 10%- and serve to position the brake shoe radially with respect to the drum 92 and prevent displacement of the shoe. The forked lower extremities of the lever 102 are provided with cam faces 1.08 which are adapted to cooperate with flattened faces 110 on the brake shoe to force the latter into engagement with the brake drum. Normally the lever 102 is held in its inoperative position and the brake shoe is maintained disengaged from the brake drum by means of a coil spring 112 which is secured at one end to the brake shoe and at its opposite end to the lever 102.

When operating the pump by power, the operating rods 16 and the pump piston will be raised at a substantially uniform speed. At the same time the shaft 20 and the brake drum 92 are set in rotation. in case the operator is instructed to pump slowly he simply depresses the lever 102 until the operating rods 16 and the pump piston are retarded to the desired degree and if necessary the pump piston may be entirely stopped by the action of the braking device. In any event the braking device permits the operator to control the speed of the pump piston as and when desired, and particularly according to the desire of the purchaser, whereas without such device it is very diiiicult to obtain the result desired. At best only an approximation of the result can be obtained by a series of stops and starts and he operator does not have complete control of the situation at all times as he does when the braking device above described is em- .ployed.

The braking device is not claimed herein but forms the subject matter of a divisional application Serial. No. 648,084, filed June 2, 1023.

Theinvention is not limited to the use of the particular braking device above described for the purpose of retarding the speed of the pump piston inasmuch as various other means may be provided for this purpose and also such means may be used with various other types of power operated pumps without departing from the spirit of the invention, v 'i ith regard to its other aspects the invention is not limited to the particulars of construction and arrangement herein shown an d described inasmuch as the same may be variously changed or modified within the scope of the appended claims.

I claim:

1. In a measuring pump, the combination with the pump cylinder, its piston and actuating mechanism, of a quantity stop movable into position to cooperate with said mechanism to limit the stroke of the piston, a casing enclosing said actuating mechanism and said quantity stop, a rod extending through an opening in the side wall of said casing and pivotally connected at its inner end with said stop, and a button secured to the rod outside of said casing whereby the rod may be actuated to move said stop into or out of operative position.

2. In a measuring pump, the combination with the pump cylinder, its piston and a member reciprocable with the piston, of a plurality of quantity stops any one. of which may be positioned in the path of said memher to limit the stroke of the piston, a casing enclosing said member and said-stops, a plurality of buttonsuponthe exterior of the casing corresponding in number to the number of the quantity stops, and rigid means severally connecting said buttons and stops whereby the former may be actuated to operatively or inoperat-ively position the latter.

3. In a measuring pump, a vmember reciprocable with the pump piston, an inverted U-shaped standard rising from the pump body, a plurality of stop-fingers pivotally mounted at one end upon one leg of the standard for independent swinging movement and adapted to be positioned across the path of said member to limit'the stroke of the piston, and a plurality of stop shoulders formed by providing notches in the other leg of said standard into which notches the free ends of said fingers are adapted to extend whereupon said shoulders will rein forcesaid fingers to prevent upward displacement of the latterby said member.

at. In a measuring pump, a member reciprocable with the pump'piston, an inverted U-shaped standard rising from the pump body, stop shoulders formed by providing notches in one leg of the standard, a plurality of stop-fingers pivotally mounted at one end upon the other leg of said standard for independent swinging movement and adapted to be positioned. across the path of movement of said member to limit the stroke of the piston, said fingers being shaped at their free extremities to enable a portion thereof to be engaged by Said stop shoulders for the purpose of reinforcing the fingers against upward displacement by said memher while another portion of said fingers en a es said le to limit the swin in v move D b b b ment of said finger to operatively position the latter.

5. In a measuring pump, the combinationacross the path of saidmember to limit the stroke of the piston, and means on the other of said bars for reinforcing said fingers when operatively positioned to prevent upward displacement thereof by said member.

6. In a measuring pump, the combination with the pump cylinder, its piston anda member reciprocable with the piston, of a plurality of quantity stops any one of which may be positioned in the path of said memher to limit the stroke of the piston, a casing enclosing said pump cylinder and having an opening at its upper end for the passage therethrough of said member, a flange on said casing surrounding said opening, a housing rising from said casing and secured at the lower end to said flange, said housing having a transverse curvature conforming to the contour of said flange and said housing comprising a plurality of vertically extending segmentshaving their longitudinal edges overlapped, rods extending through one of said casing sections and severally connected at their inner ends with said stop fingers, andbutt-ons secured to-the opposite ends of said rods outside of the casing whereby the rods may be actuated to operate said stop fingers.

7. In a dispensing apparatus, a reciprocating pistonpump having a piston rod extending vertically upwardthrough one end thereof, a cross-head fixed to the piston rod, operating rods fixed to and depending from the cross-head on opposite side of the piston rod, means for actuating said operating rods to move the pistonrod, and means for enclosing the latter and said operating rods in their reciprocating movement comprising a dome surmounting said end of the pump and having an elliptical opening therein en-' compassed by an elliptical flange, a member spaced above the dome and having a. similar opening and flange, oppositely disposed plates having a curved cross-section of relatively large radius connecting said flanges and enclosing the space therebetween exceptfor relatively small openings at opposite ends thereof, and strips having a curved I cross-section of relatively small radius exsignature.

. JOHN B. DAVIS. 

